Hillary Lin, MD | The Longevity Letter

Oliver Buchannon

Hillary Lin, MD

Stanford MD & CareCore CEO translating longevity science into actionable health protocols.

Your Biological Age Test Might Be Lying to You

Mar 23, 2026

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30 min read

Your Biological Age Test Might Be Lying to You

Hillary Lin, MD

Your Brain Is Still Growing New Neurons.

Mar 4, 2026

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15 min read

Your Brain Is Still Growing New Neurons.

Here's What Decides How Well It Does.

Hillary Lin, MD

GRAIL's Cancer Test Just Failed Its Big Trial. Here's Why I Still Use It.

Feb 25, 2026

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20 min read

GRAIL's Cancer Test Just Failed Its Big Trial. Here's Why I Still Use It.

The full MCED landscape, my 5-layer screening protocol, and 8 quick hits in longevity science.

Hillary Lin, MD

Why I prescribe Rapamycin - but not to most of my patients

Feb 12, 2026

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14 min read

Why I prescribe Rapamycin - but not to most of my patients

Hillary Lin, MD

Is 50% of your lifespan already "decided"?

Feb 3, 2026

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15 min read

Is 50% of your lifespan already "decided"?

Hillary Lin, MD